18558242 has 8 divisors (see below), whose sum is σ = 27913116. Its totient is φ = 9253872.

The previous prime is 18558233. The next prime is 18558257. The reversal of 18558242 is 24285581.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16394401 + 2163841 = 4049^2 + 1471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18558242² = 688816692261128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11693 + ... + 13184.

Almost surely, 2^18558242 is an apocalyptic number.

18558242 is a deficient number, since it is larger than the sum of its proper divisors (9354874).

18558242 is a wasteful number, since it uses less digits than its factorization.

18558242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25252.

The product of its digits is 25600, while the sum is 35.

The square root of 18558242 is about 4307.9278081231. The cubic root of 18558242 is about 264.7558781828.

The spelling of 18558242 in words is "eighteen million, five hundred fifty-eight thousand, two hundred forty-two".